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String bits without doubling
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Theoretical Physics.
2003 In: Journal of High Energy Physics, ISSN 1029-8479, Vol. 03, no 10, 026- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2003. Vol. 03, no 10, 026- p.
URN: urn:nbn:se:uu:diva-91253OAI: oai:DiVA.org:uu-91253DiVA: diva2:163920
Available from: 2003-12-22 Created: 2003-12-22Bibliographically approved
In thesis
1. Torn, Spun and Chopped: Various Limits of String Theory
Open this publication in new window or tab >>Torn, Spun and Chopped: Various Limits of String Theory
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For the first time in the history of physics we stand in front of a theory that might actually serve as a unification of it all - string theory. It provides a self-consistent framework for gravity and quantum mechanics, which naturally incorporates matter and gauge interactions of the type seen in the standard model. Unfortunately, at the moment we do not know of any principle that selects the vacuum of the theory, so predictions about our four-dimensional world are still absent. However, the introduction of extended objects opens up an intricate new arena of physics, which is non-trivial and challenging to map out, even at a basic level.

A key concept of quantum gravity is holography; this is realised in string theory by the AdS/CFT correspondence, which relates string theory to a field theory living in a lower dimensional space. In this thesis we discuss two limits of the correspondence, namely the BMN limit, giving rise to a plane wave geometry, and the tensionless limit, exhibiting massless higher spin interactions. We also study a limit of string theory in a background electric field, where the theory is described by open strings and positively wound closed strings only.

We begin with a brief review of the theory, focusing on an intuitive understanding of the basic aspects and serving as an introduction to the papers. In the first paper we calculate, from two different points of view, scattering amplitudes in the non-commutative open string limit. In the second paper we obtain the quadratic scalar field contributions to the stress-energy tensor in the minimal bosonic higher spin gauge theory in four dimensions. In the last paper we propose a way to avoid fermion doubling when discretizing the string in the BMN limit.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 70 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 926
Theoretical physics, Theoretical physics, String theory, D-branes, Non-commutative open string theory, AdS/CFT, Higher spin gauge theory, BMN, String bits, Fermion doubling, Teoretisk fysik
National Category
Physical Sciences
urn:nbn:se:uu:diva-3930 (URN)91-554-5848-3 (ISBN)
Public defence
2004-01-20, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Available from: 2003-12-22 Created: 2003-12-22Bibliographically approved

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